Abstract: Perturbations by pulse-modulated microwave radiation
from GSM mobile phones on neuron cell membrane
gating and calcium oscillations have been suggested
as a possible mechanism underlying activation of brain
states and electroencephalographic epiphenomena. As
the employ of UMTS phones seems to reveal other symptoms,
a unified phenomenological framework is needed. In order
to explain possible effects of mobile phone radiation
on cell oscillations, GSM and UMTS low-frequency envelopes
have been detected, recorded and used as input in cell
models. Dynamical systems endowed with contiguous regular
and chaotic regimes suitable to produce stochastic resonance
can both account for the perturbation of the neuro-electrical
activity and even for the low intensity of the signal perceived
by high sensitive subjects. Neuron models of this kind
can be employed as a reductionist hint for the mentioned
phenomenology. The Hindmarsh-Rose model exhibits frequency
enhancement and regularization phenomena induced by weak
GSM and UMTS. More realistic simulations of cell membrane
gating and calcium oscillations have been performed with
the help of an adaptation of the Chay-Keizer dynamical system.
This scheme can explain the suspected subjective sensitivity
to mobile phone signals under the thermal threshold, in
terms of cell calcium regularity mechanisms. Concerning the
two kinds of emission, the stronger occupation of the ELF band
of last generation UMTS phones is compensated by lower power emitted.